[PATCH v2 23/44] mmap: Use vmi version of vma_merge()

From: Liam Howlett
Date: Thu Jan 05 2023 - 14:18:50 EST


From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>

Use the vma iterator so that the iterator can be invalidated or updated
to avoid each caller doing so.

Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
mm/mmap.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 80f12fcf158c..579d586e4e6a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2748,8 +2748,9 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
* vma again as we may succeed this time.
*/
if (unlikely(vm_flags != vma->vm_flags && prev)) {
- merge = vma_merge(mm, prev, vma->vm_start, vma->vm_end, vma->vm_flags,
- NULL, vma->vm_file, vma->vm_pgoff, NULL, NULL_VM_UFFD_CTX, NULL);
+ merge = vmi_vma_merge(&vmi, mm, prev, vma->vm_start,
+ vma->vm_end, vma->vm_flags, NULL, vma->vm_file,
+ vma->vm_pgoff, NULL, NULL_VM_UFFD_CTX, NULL);
if (merge) {
/*
* ->mmap() can change vma->vm_file and fput
@@ -3280,6 +3281,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
struct mm_struct *mm = vma->vm_mm;
struct vm_area_struct *new_vma, *prev;
bool faulted_in_anon_vma = true;
+ VMA_ITERATOR(vmi, mm, addr);

validate_mm_mt(mm);
/*
@@ -3295,7 +3297,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
if (new_vma && new_vma->vm_start < addr + len)
return NULL; /* should never get here */

- new_vma = vma_merge(mm, prev, addr, addr + len, vma->vm_flags,
+ new_vma = vmi_vma_merge(&vmi, mm, prev, addr, addr + len, vma->vm_flags,
vma->anon_vma, vma->vm_file, pgoff, vma_policy(vma),
vma->vm_userfaultfd_ctx, anon_vma_name(vma));
if (new_vma) {
--
2.35.1